x86, ACPI, mm: Revert movablemem_map support

Tim found:

  WARNING: at arch/x86/kernel/smpboot.c:324 topology_sane.isra.2+0x6f/0x80()
  Hardware name: S2600CP
  sched: CPU #1's llc-sibling CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency.
  smpboot: Booting Node   1, Processors  #1
  Modules linked in:
  Pid: 0, comm: swapper/1 Not tainted 3.9.0-0-generic #1
  Call Trace:
    set_cpu_sibling_map+0x279/0x449
    start_secondary+0x11d/0x1e5

Don Morris reproduced on a HP z620 workstation, and bisected it to
commit e8d19552 ("acpi, memory-hotplug: parse SRAT before memblock
is ready")

It turns out movable_map has some problems, and it breaks several things

1. numa_init is called several times, NOT just for srat. so those
	nodes_clear(numa_nodes_parsed)
	memset(&numa_meminfo, 0, sizeof(numa_meminfo))
   can not be just removed.  Need to consider sequence is: numaq, srat, amd, dummy.
   and make fall back path working.

2. simply split acpi_numa_init to early_parse_srat.
   a. that early_parse_srat is NOT called for ia64, so you break ia64.
   b.  for (i = 0; i < MAX_LOCAL_APIC; i++)
	     set_apicid_to_node(i, NUMA_NO_NODE)
     still left in numa_init. So it will just clear result from early_parse_srat.
     it should be moved before that....
   c.  it breaks ACPI_TABLE_OVERIDE...as the acpi table scan is moved
       early before override from INITRD is settled.

3. that patch TITLE is total misleading, there is NO x86 in the title,
   but it changes critical x86 code. It caused x86 guys did not
   pay attention to find the problem early. Those patches really should
   be routed via tip/x86/mm.

4. after that commit, following range can not use movable ram:
  a. real_mode code.... well..funny, legacy Node0 [0,1M) could be hot-removed?
  b. initrd... it will be freed after booting, so it could be on movable...
  c. crashkernel for kdump...: looks like we can not put kdump kernel above 4G
	anymore.
  d. init_mem_mapping: can not put page table high anymore.
  e. initmem_init: vmemmap can not be high local node anymore. That is
     not good.

If node is hotplugable, the mem related range like page table and
vmemmap could be on the that node without problem and should be on that
node.

We have workaround patch that could fix some problems, but some can not
be fixed.

So just remove that offending commit and related ones including:

 f7210e6c ("mm/memblock.c: use CONFIG_HAVE_MEMBLOCK_NODE_MAP to
    protect movablecore_map in memblock_overlaps_region().")

 01a178a9 ("acpi, memory-hotplug: support getting hotplug info from
    SRAT")

 27168d38 ("acpi, memory-hotplug: extend movablemem_map ranges to
    the end of node")

 e8d19552 ("acpi, memory-hotplug: parse SRAT before memblock is
    ready")

 fb06bc8e ("page_alloc: bootmem limit with movablecore_map")

 42f47e27 ("page_alloc: make movablemem_map have higher priority")

 6981ec31 ("page_alloc: introduce zone_movable_limit[] to keep
    movable limit for nodes")

 34b71f1e ("page_alloc: add movable_memmap kernel parameter")

 4d59a751 ("x86: get pg_data_t's memory from other node")

Later we should have patches that will make sure kernel put page table
and vmemmap on local node ram instead of push them down to node0.  Also
need to find way to put other kernel used ram to local node ram.
Reported-by: Tim Gardner <tim.gardner@canonical.com>
Reported-by: Don Morris <don.morris@hp.com>
Bisected-by: Don Morris <don.morris@hp.com>
Tested-by: Don Morris <don.morris@hp.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/kernel-parameters.txt

@@ -1645,42 +1645,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			that the amount of memory usable for all allocations
 			is not too small.
 
-	movablemem_map=acpi
-			[KNL,X86,IA-64,PPC] This parameter is similar to
-			memmap except it specifies the memory map of
-			ZONE_MOVABLE.
-			This option inform the kernel to use Hot Pluggable bit
-			in flags from SRAT from ACPI BIOS to determine which
-			memory devices could be hotplugged. The corresponding
-			memory ranges will be set as ZONE_MOVABLE.
-			NOTE: Whatever node the kernel resides in will always
-			      be un-hotpluggable.
-
-	movablemem_map=nn[KMG]@ss[KMG]
-			[KNL,X86,IA-64,PPC] This parameter is similar to
-			memmap except it specifies the memory map of
-			ZONE_MOVABLE.
-			If user specifies memory ranges, the info in SRAT will
-			be ingored. And it works like the following:
-			- If more ranges are all within one node, then from
-			  lowest ss to the end of the node will be ZONE_MOVABLE.
-			- If a range is within a node, then from ss to the end
-			  of the node will be ZONE_MOVABLE.
-			- If a range covers two or more nodes, then from ss to
-			  the end of the 1st node will be ZONE_MOVABLE, and all
-			  the rest nodes will only have ZONE_MOVABLE.
-			If memmap is specified at the same time, the
-			movablemem_map will be limited within the memmap
-			areas. If kernelcore or movablecore is also specified,
-			movablemem_map will have higher priority to be
-			satisfied. So the administrator should be careful that
-			the amount of movablemem_map areas are not too large.
-			Otherwise kernel won't have enough memory to start.
-			NOTE: We don't stop users specifying the node the
-			      kernel resides in as hotpluggable so that this
-			      option can be used as a workaround of firmware
-                              bugs.
-
 	MTD_Partition=	[MTD]
 			Format: <name>,<region-number>,<size>,<offset>
 

arch/x86/kernel/setup.c

@@ -1056,15 +1056,6 @@ void __init setup_arch(char **cmdline_p)
 	setup_bios_corruption_check();
 #endif
 
-	/*
-	 * In the memory hotplug case, the kernel needs info from SRAT to
-	 * determine which memory is hotpluggable before allocating memory
-	 * using memblock.
-	 */
-	acpi_boot_table_init();
-	early_acpi_boot_init();
-	early_parse_srat();
-
 #ifdef CONFIG_X86_32
 	printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
 			(max_pfn_mapped<<PAGE_SHIFT) - 1);
@@ -1110,6 +1101,10 @@ void __init setup_arch(char **cmdline_p)
 	/*
 	 * Parse the ACPI tables for possible boot-time SMP configuration.
 	 */
+	acpi_boot_table_init();
+
+	early_acpi_boot_init();
+
 	initmem_init();
 	memblock_find_dma_reserve();
 

arch/x86/mm/numa.c

@@ -212,9 +212,10 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
 	 * Allocate node data.  Try node-local memory and then any node.
 	 * Never allocate in DMA zone.
 	 */
-	nd_pa = memblock_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
+	nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid);
 	if (!nd_pa) {
-		pr_err("Cannot find %zu bytes in any node\n", nd_size);
+		pr_err("Cannot find %zu bytes in node %d\n",
+		       nd_size, nid);
 		return;
 	}
 	nd = __va(nd_pa);
@@ -559,12 +560,10 @@ static int __init numa_init(int (*init_func)(void))
 	for (i = 0; i < MAX_LOCAL_APIC; i++)
 		set_apicid_to_node(i, NUMA_NO_NODE);
 
-	/*
-	 * Do not clear numa_nodes_parsed or zero numa_meminfo here, because
-	 * SRAT was parsed earlier in early_parse_srat().
-	 */
+	nodes_clear(numa_nodes_parsed);
 	nodes_clear(node_possible_map);
 	nodes_clear(node_online_map);
+	memset(&numa_meminfo, 0, sizeof(numa_meminfo));
 	WARN_ON(memblock_set_node(0, ULLONG_MAX, MAX_NUMNODES));
 	numa_reset_distance();
 

arch/x86/mm/srat.c

@@ -141,126 +141,11 @@ static inline int save_add_info(void) {return 1;}
 static inline int save_add_info(void) {return 0;}
 #endif
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
-static void __init
-handle_movablemem(int node, u64 start, u64 end, u32 hotpluggable)
-{
-	int overlap, i;
-	unsigned long start_pfn, end_pfn;
-
-	start_pfn = PFN_DOWN(start);
-	end_pfn = PFN_UP(end);
-
-	/*
-	 * For movablemem_map=acpi:
-	 *
-	 * SRAT:		|_____| |_____| |_________| |_________| ......
-	 * node id:                0       1         1           2
-	 * hotpluggable:	   n       y         y           n
-	 * movablemem_map:	        |_____| |_________|
-	 *
-	 * Using movablemem_map, we can prevent memblock from allocating memory
-	 * on ZONE_MOVABLE at boot time.
-	 *
-	 * Before parsing SRAT, memblock has already reserve some memory ranges
-	 * for other purposes, such as for kernel image. We cannot prevent
-	 * kernel from using these memory, so we need to exclude these memory
-	 * even if it is hotpluggable.
-	 * Furthermore, to ensure the kernel has enough memory to boot, we make
-	 * all the memory on the node which the kernel resides in
-	 * un-hotpluggable.
-	 */
-	if (hotpluggable && movablemem_map.acpi) {
-		/* Exclude ranges reserved by memblock. */
-		struct memblock_type *rgn = &memblock.reserved;
-
-		for (i = 0; i < rgn->cnt; i++) {
-			if (end <= rgn->regions[i].base ||
-			    start >= rgn->regions[i].base +
-			    rgn->regions[i].size)
-				continue;
-
-			/*
-			 * If the memory range overlaps the memory reserved by
-			 * memblock, then the kernel resides in this node.
-			 */
-			node_set(node, movablemem_map.numa_nodes_kernel);
-
-			goto out;
-		}
-
-		/*
-		 * If the kernel resides in this node, then the whole node
-		 * should not be hotpluggable.
-		 */
-		if (node_isset(node, movablemem_map.numa_nodes_kernel))
-			goto out;
-
-		insert_movablemem_map(start_pfn, end_pfn);
-
-		/*
-		 * numa_nodes_hotplug nodemask represents which nodes are put
-		 * into movablemem_map.map[].
-		 */
-		node_set(node, movablemem_map.numa_nodes_hotplug);
-		goto out;
-	}
-
-	/*
-	 * For movablemem_map=nn[KMG]@ss[KMG]:
-	 *
-	 * SRAT:		|_____| |_____| |_________| |_________| ......
-	 * node id:		   0       1         1           2
-	 * user specified:	          |__|                 |___|
-	 * movablemem_map:		  |___| |_________|    |______| ......
-	 *
-	 * Using movablemem_map, we can prevent memblock from allocating memory
-	 * on ZONE_MOVABLE at boot time.
-	 *
-	 * NOTE: In this case, SRAT info will be ingored.
-	 */
-	overlap = movablemem_map_overlap(start_pfn, end_pfn);
-	if (overlap >= 0) {
-		/*
-		 * If part of this range is in movablemem_map, we need to
-		 * add the range after it to extend the range to the end
-		 * of the node, because from the min address specified to
-		 * the end of the node will be ZONE_MOVABLE.
-		 */
-		start_pfn = max(start_pfn,
-			    movablemem_map.map[overlap].start_pfn);
-		insert_movablemem_map(start_pfn, end_pfn);
-
-		/*
-		 * Set the nodemask, so that if the address range on one node
-		 * is not continuse, we can add the subsequent ranges on the
-		 * same node into movablemem_map.
-		 */
-		node_set(node, movablemem_map.numa_nodes_hotplug);
-	} else {
-		if (node_isset(node, movablemem_map.numa_nodes_hotplug))
-			/*
-			 * Insert the range if we already have movable ranges
-			 * on the same node.
-			 */
-			insert_movablemem_map(start_pfn, end_pfn);
-	}
-out:
-	return;
-}
-#else		/* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-static inline void
-handle_movablemem(int node, u64 start, u64 end, u32 hotpluggable)
-{
-}
-#endif		/* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
-
 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
 int __init
 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 {
 	u64 start, end;
-	u32 hotpluggable;
 	int node, pxm;
 
 	if (srat_disabled())
@@ -269,8 +154,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 		goto out_err_bad_srat;
 	if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 		goto out_err;
-	hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
-	if (hotpluggable && !save_add_info())
+	if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
 		goto out_err;
 
 	start = ma->base_address;
@@ -290,12 +174,9 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 
 	node_set(node, numa_nodes_parsed);
 
-	printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx] %s\n",
+	printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]\n",
 	       node, pxm,
-	       (unsigned long long) start, (unsigned long long) end - 1,
-	       hotpluggable ? "Hot Pluggable": "");
-
-	handle_movablemem(node, start, end, hotpluggable);
+	       (unsigned long long) start, (unsigned long long) end - 1);
 
 	return 0;
 out_err_bad_srat:

drivers/acpi/numa.c

@@ -282,10 +282,10 @@ acpi_table_parse_srat(enum acpi_srat_type id,
 					    handler, max_entries);
 }
 
-static int srat_mem_cnt;
-
-void __init early_parse_srat(void)
+int __init acpi_numa_init(void)
 {
+	int cnt = 0;
+
 	/*
 	 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 	 * SRAT cpu entries could have different order with that in MADT.
@@ -295,24 +295,21 @@ void __init early_parse_srat(void)
 	/* SRAT: Static Resource Affinity Table */
 	if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
-				      acpi_parse_x2apic_affinity, 0);
+				     acpi_parse_x2apic_affinity, 0);
 		acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
-				      acpi_parse_processor_affinity, 0);
-		srat_mem_cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
-						     acpi_parse_memory_affinity,
-						     NR_NODE_MEMBLKS);
+				     acpi_parse_processor_affinity, 0);
+		cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
+					    acpi_parse_memory_affinity,
+					    NR_NODE_MEMBLKS);
 	}
-}
 
-int __init acpi_numa_init(void)
-{
 	/* SLIT: System Locality Information Table */
 	acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 
 	acpi_numa_arch_fixup();
 
-	if (srat_mem_cnt < 0)
-		return srat_mem_cnt;
+	if (cnt < 0)
+		return cnt;
 	else if (!parsed_numa_memblks)
 		return -ENOENT;
 	return 0;

include/linux/acpi.h

@@ -485,14 +485,6 @@ static inline bool acpi_driver_match_device(struct device *dev,
 
 #endif	/* !CONFIG_ACPI */
 
-#ifdef CONFIG_ACPI_NUMA
-void __init early_parse_srat(void);
-#else
-static inline void early_parse_srat(void)
-{
-}
-#endif
-
 #ifdef CONFIG_ACPI
 void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
 			       u32 pm1a_ctrl,  u32 pm1b_ctrl));

include/linux/memblock.h

@@ -42,7 +42,6 @@ struct memblock {
 
 extern struct memblock memblock;
 extern int memblock_debug;
-extern struct movablemem_map movablemem_map;
 
 #define memblock_dbg(fmt, ...) \
 	if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
@@ -61,7 +60,6 @@ int memblock_reserve(phys_addr_t base, phys_addr_t size);
 void memblock_trim_memory(phys_addr_t align);
 
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
-
 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
 			  unsigned long *out_end_pfn, int *out_nid);
 

include/linux/mm.h

@@ -1333,24 +1333,6 @@ extern void free_bootmem_with_active_regions(int nid,
 						unsigned long max_low_pfn);
 extern void sparse_memory_present_with_active_regions(int nid);
 
-#define MOVABLEMEM_MAP_MAX MAX_NUMNODES
-struct movablemem_entry {
-	unsigned long start_pfn;    /* start pfn of memory segment */
-	unsigned long end_pfn;      /* end pfn of memory segment (exclusive) */
-};
-
-struct movablemem_map {
-	bool acpi;	/* true if using SRAT info */
-	int nr_map;
-	struct movablemem_entry map[MOVABLEMEM_MAP_MAX];
-	nodemask_t numa_nodes_hotplug;	/* on which nodes we specify memory */
-	nodemask_t numa_nodes_kernel;	/* on which nodes kernel resides in */
-};
-
-extern void __init insert_movablemem_map(unsigned long start_pfn,
-					 unsigned long end_pfn);
-extern int __init movablemem_map_overlap(unsigned long start_pfn,
-					 unsigned long end_pfn);
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \

mm/memblock.c

@@ -92,58 +92,9 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
  *
  * Find @size free area aligned to @align in the specified range and node.
  *
- * If we have CONFIG_HAVE_MEMBLOCK_NODE_MAP defined, we need to check if the
- * memory we found if not in hotpluggable ranges.
- *
  * RETURNS:
  * Found address on success, %0 on failure.
  */
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
-phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
-					phys_addr_t end, phys_addr_t size,
-					phys_addr_t align, int nid)
-{
-	phys_addr_t this_start, this_end, cand;
-	u64 i;
-	int curr = movablemem_map.nr_map - 1;
-
-	/* pump up @end */
-	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
-		end = memblock.current_limit;
-
-	/* avoid allocating the first page */
-	start = max_t(phys_addr_t, start, PAGE_SIZE);
-	end = max(start, end);
-
-	for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
-		this_start = clamp(this_start, start, end);
-		this_end = clamp(this_end, start, end);
-
-restart:
-		if (this_end <= this_start || this_end < size)
-			continue;
-
-		for (; curr >= 0; curr--) {
-			if ((movablemem_map.map[curr].start_pfn << PAGE_SHIFT)
-			    < this_end)
-				break;
-		}
-
-		cand = round_down(this_end - size, align);
-		if (curr >= 0 &&
-		    cand < movablemem_map.map[curr].end_pfn << PAGE_SHIFT) {
-			this_end = movablemem_map.map[curr].start_pfn
-				   << PAGE_SHIFT;
-			goto restart;
-		}
-
-		if (cand >= this_start)
-			return cand;
-	}
-
-	return 0;
-}
-#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 					phys_addr_t end, phys_addr_t size,
 					phys_addr_t align, int nid)
@@ -172,7 +123,6 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
 	}
 	return 0;
 }
-#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 /**
  * memblock_find_in_range - find free area in given range